Excellent, if tiring, tour. The joining instructions were easy to follow and the tour started promptly. Our guide was extremely knowledgeable, enthusiastic and pointed out many items during the tour that would have escaped us. The audio system worked well, despite the backgrond hubbub. For the tour guide herdelf, she combined humour with challenging questions for us, making sure that we got the very most out of the 3 hours, despite the crowds of similarly minded tourists who all wanted to see what we wanted to see. I certainly recommend using this tour operator.